Robert posted a picture of himself and Charlie and tweeted: ''I just cast Charlie Sheen in #machetekills as the President of the United States! Who better? More soon..(sic)''

Following the message, the 46-year-old actor retweeted the post on his own twitter account and added the words: ''My fellow Americans!''

The former 'Two and a Half Men' star might seek advice from his father Martin Sheen as the 71-year-old star has previously portrayed a number of US presidents including John F. Kennedy in miniseries 'Kennedy - The Presidential Years' and fictional political figure Josiah Bartlet in TV series 'The West Wing'.